"A steamboat is a boat that is propelled primarily by steam power, typically driving propellers or paddlewheels. Steamboats sometimes use the prefix designation SS, S.S. or S/S (for ´Screw Steamer´) or PS (for ´Paddle Steamer´); however, these designations are most often used for steamships.
The term steamboat is used to refer to smaller, insular, steam-powered boats working on lakes and rivers, particularly riverboats. As using steam became more reliable, steam power became applied to larger, ocean-going vessels." - (en.wikipedia.org 13.05.2021)
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